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10#include "ipvlan.h"
11
12static u32 ipvlan_jhash_secret __read_mostly;
13
14void ipvlan_init_secret(void)
15{
16 net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
17}
18
19void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
20 unsigned int len, bool success, bool mcast)
21{
22 if (likely(success)) {
23 struct ipvl_pcpu_stats *pcptr;
24
25 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
26 u64_stats_update_begin(&pcptr->syncp);
27 pcptr->rx_pkts++;
28 pcptr->rx_bytes += len;
29 if (mcast)
30 pcptr->rx_mcast++;
31 u64_stats_update_end(&pcptr->syncp);
32 } else {
33 this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
34 }
35}
36EXPORT_SYMBOL_GPL(ipvlan_count_rx);
37
38#if IS_ENABLED(CONFIG_IPV6)
39static u8 ipvlan_get_v6_hash(const void *iaddr)
40{
41 const struct in6_addr *ip6_addr = iaddr;
42
43 return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
44 IPVLAN_HASH_MASK;
45}
46#else
47static u8 ipvlan_get_v6_hash(const void *iaddr)
48{
49 return 0;
50}
51#endif
52
53static u8 ipvlan_get_v4_hash(const void *iaddr)
54{
55 const struct in_addr *ip4_addr = iaddr;
56
57 return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) &
58 IPVLAN_HASH_MASK;
59}
60
61static bool addr_equal(bool is_v6, struct ipvl_addr *addr, const void *iaddr)
62{
63 if (!is_v6 && addr->atype == IPVL_IPV4) {
64 struct in_addr *i4addr = (struct in_addr *)iaddr;
65
66 return addr->ip4addr.s_addr == i4addr->s_addr;
67#if IS_ENABLED(CONFIG_IPV6)
68 } else if (is_v6 && addr->atype == IPVL_IPV6) {
69 struct in6_addr *i6addr = (struct in6_addr *)iaddr;
70
71 return ipv6_addr_equal(&addr->ip6addr, i6addr);
72#endif
73 }
74
75 return false;
76}
77
78static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
79 const void *iaddr, bool is_v6)
80{
81 struct ipvl_addr *addr;
82 u8 hash;
83
84 hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
85 ipvlan_get_v4_hash(iaddr);
86 hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode)
87 if (addr_equal(is_v6, addr, iaddr))
88 return addr;
89 return NULL;
90}
91
92void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
93{
94 struct ipvl_port *port = ipvlan->port;
95 u8 hash;
96
97 hash = (addr->atype == IPVL_IPV6) ?
98 ipvlan_get_v6_hash(&addr->ip6addr) :
99 ipvlan_get_v4_hash(&addr->ip4addr);
100 if (hlist_unhashed(&addr->hlnode))
101 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
102}
103
104void ipvlan_ht_addr_del(struct ipvl_addr *addr)
105{
106 hlist_del_init_rcu(&addr->hlnode);
107}
108
109struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
110 const void *iaddr, bool is_v6)
111{
112 struct ipvl_addr *addr, *ret = NULL;
113
114 rcu_read_lock();
115 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) {
116 if (addr_equal(is_v6, addr, iaddr)) {
117 ret = addr;
118 break;
119 }
120 }
121 rcu_read_unlock();
122 return ret;
123}
124
125bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
126{
127 struct ipvl_dev *ipvlan;
128 bool ret = false;
129
130 rcu_read_lock();
131 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
132 if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) {
133 ret = true;
134 break;
135 }
136 }
137 rcu_read_unlock();
138 return ret;
139}
140
141static void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type)
142{
143 void *lyr3h = NULL;
144
145 switch (skb->protocol) {
146 case htons(ETH_P_ARP): {
147 struct arphdr *arph;
148
149 if (unlikely(!pskb_may_pull(skb, arp_hdr_len(port->dev))))
150 return NULL;
151
152 arph = arp_hdr(skb);
153 *type = IPVL_ARP;
154 lyr3h = arph;
155 break;
156 }
157 case htons(ETH_P_IP): {
158 u32 pktlen;
159 struct iphdr *ip4h;
160
161 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
162 return NULL;
163
164 ip4h = ip_hdr(skb);
165 pktlen = ntohs(ip4h->tot_len);
166 if (ip4h->ihl < 5 || ip4h->version != 4)
167 return NULL;
168 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
169 return NULL;
170
171 *type = IPVL_IPV4;
172 lyr3h = ip4h;
173 break;
174 }
175#if IS_ENABLED(CONFIG_IPV6)
176 case htons(ETH_P_IPV6): {
177 struct ipv6hdr *ip6h;
178
179 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
180 return NULL;
181
182 ip6h = ipv6_hdr(skb);
183 if (ip6h->version != 6)
184 return NULL;
185
186 *type = IPVL_IPV6;
187 lyr3h = ip6h;
188
189 if (ipv6_addr_any(&ip6h->saddr) &&
190 ip6h->nexthdr == NEXTHDR_ICMP) {
191 struct icmp6hdr *icmph;
192
193 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph))))
194 return NULL;
195
196 ip6h = ipv6_hdr(skb);
197 icmph = (struct icmp6hdr *)(ip6h + 1);
198
199 if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
200
201 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)
202 + sizeof(struct in6_addr))))
203 return NULL;
204
205 ip6h = ipv6_hdr(skb);
206 icmph = (struct icmp6hdr *)(ip6h + 1);
207 }
208
209 *type = IPVL_ICMPV6;
210 lyr3h = icmph;
211 }
212 break;
213 }
214#endif
215 default:
216 return NULL;
217 }
218
219 return lyr3h;
220}
221
222unsigned int ipvlan_mac_hash(const unsigned char *addr)
223{
224 u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
225 ipvlan_jhash_secret);
226
227 return hash & IPVLAN_MAC_FILTER_MASK;
228}
229
230void ipvlan_process_multicast(struct work_struct *work)
231{
232 struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
233 struct ethhdr *ethh;
234 struct ipvl_dev *ipvlan;
235 struct sk_buff *skb, *nskb;
236 struct sk_buff_head list;
237 unsigned int len;
238 unsigned int mac_hash;
239 int ret;
240 u8 pkt_type;
241 bool tx_pkt;
242
243 __skb_queue_head_init(&list);
244
245 spin_lock_bh(&port->backlog.lock);
246 skb_queue_splice_tail_init(&port->backlog, &list);
247 spin_unlock_bh(&port->backlog.lock);
248
249 while ((skb = __skb_dequeue(&list)) != NULL) {
250 struct net_device *dev = skb->dev;
251 bool consumed = false;
252
253 ethh = eth_hdr(skb);
254 tx_pkt = IPVL_SKB_CB(skb)->tx_pkt;
255 mac_hash = ipvlan_mac_hash(ethh->h_dest);
256
257 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
258 pkt_type = PACKET_BROADCAST;
259 else
260 pkt_type = PACKET_MULTICAST;
261
262 rcu_read_lock();
263 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
264 if (tx_pkt && (ipvlan->dev == skb->dev))
265 continue;
266 if (!test_bit(mac_hash, ipvlan->mac_filters))
267 continue;
268 if (!(ipvlan->dev->flags & IFF_UP))
269 continue;
270 ret = NET_RX_DROP;
271 len = skb->len + ETH_HLEN;
272 nskb = skb_clone(skb, GFP_ATOMIC);
273 local_bh_disable();
274 if (nskb) {
275 consumed = true;
276 nskb->pkt_type = pkt_type;
277 nskb->dev = ipvlan->dev;
278 if (tx_pkt)
279 ret = dev_forward_skb(ipvlan->dev, nskb);
280 else
281 ret = netif_rx(nskb);
282 }
283 ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
284 local_bh_enable();
285 }
286 rcu_read_unlock();
287
288 if (tx_pkt) {
289
290 skb->dev = port->dev;
291 skb->pkt_type = pkt_type;
292 dev_queue_xmit(skb);
293 } else {
294 if (consumed)
295 consume_skb(skb);
296 else
297 kfree_skb(skb);
298 }
299 if (dev)
300 dev_put(dev);
301 cond_resched();
302 }
303}
304
305static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
306{
307 bool xnet = true;
308
309 if (dev)
310 xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
311
312 skb_scrub_packet(skb, xnet);
313 if (dev)
314 skb->dev = dev;
315}
316
317static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
318 bool local)
319{
320 struct ipvl_dev *ipvlan = addr->master;
321 struct net_device *dev = ipvlan->dev;
322 unsigned int len;
323 rx_handler_result_t ret = RX_HANDLER_CONSUMED;
324 bool success = false;
325 struct sk_buff *skb = *pskb;
326
327 len = skb->len + ETH_HLEN;
328
329
330
331 if (local) {
332 if (unlikely(!(dev->flags & IFF_UP))) {
333 kfree_skb(skb);
334 goto out;
335 }
336
337 skb = skb_share_check(skb, GFP_ATOMIC);
338 if (!skb)
339 goto out;
340
341 *pskb = skb;
342 }
343
344 if (local) {
345 skb->pkt_type = PACKET_HOST;
346 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
347 success = true;
348 } else {
349 skb->dev = dev;
350 ret = RX_HANDLER_ANOTHER;
351 success = true;
352 }
353
354out:
355 ipvlan_count_rx(ipvlan, len, success, false);
356 return ret;
357}
358
359static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
360 void *lyr3h, int addr_type,
361 bool use_dest)
362{
363 struct ipvl_addr *addr = NULL;
364
365 switch (addr_type) {
366#if IS_ENABLED(CONFIG_IPV6)
367 case IPVL_IPV6: {
368 struct ipv6hdr *ip6h;
369 struct in6_addr *i6addr;
370
371 ip6h = (struct ipv6hdr *)lyr3h;
372 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
373 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
374 break;
375 }
376 case IPVL_ICMPV6: {
377 struct nd_msg *ndmh;
378 struct in6_addr *i6addr;
379
380
381
382
383 ndmh = (struct nd_msg *)lyr3h;
384 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
385 i6addr = &ndmh->target;
386 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
387 }
388 break;
389 }
390#endif
391 case IPVL_IPV4: {
392 struct iphdr *ip4h;
393 __be32 *i4addr;
394
395 ip4h = (struct iphdr *)lyr3h;
396 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
397 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
398 break;
399 }
400 case IPVL_ARP: {
401 struct arphdr *arph;
402 unsigned char *arp_ptr;
403 __be32 dip;
404
405 arph = (struct arphdr *)lyr3h;
406 arp_ptr = (unsigned char *)(arph + 1);
407 if (use_dest)
408 arp_ptr += (2 * port->dev->addr_len) + 4;
409 else
410 arp_ptr += port->dev->addr_len;
411
412 memcpy(&dip, arp_ptr, 4);
413 addr = ipvlan_ht_addr_lookup(port, &dip, false);
414 break;
415 }
416 }
417
418 return addr;
419}
420
421static int ipvlan_process_v4_outbound(struct sk_buff *skb)
422{
423 const struct iphdr *ip4h = ip_hdr(skb);
424 struct net_device *dev = skb->dev;
425 struct net *net = dev_net(dev);
426 struct rtable *rt;
427 int err, ret = NET_XMIT_DROP;
428 struct flowi4 fl4 = {
429 .flowi4_oif = dev->ifindex,
430 .flowi4_tos = RT_TOS(ip4h->tos),
431 .flowi4_flags = FLOWI_FLAG_ANYSRC,
432 .flowi4_mark = skb->mark,
433 .daddr = ip4h->daddr,
434 .saddr = ip4h->saddr,
435 };
436
437 rt = ip_route_output_flow(net, &fl4, NULL);
438 if (IS_ERR(rt))
439 goto err;
440
441 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
442 ip_rt_put(rt);
443 goto err;
444 }
445 skb_dst_set(skb, &rt->dst);
446 err = ip_local_out(net, skb->sk, skb);
447 if (unlikely(net_xmit_eval(err)))
448 dev->stats.tx_errors++;
449 else
450 ret = NET_XMIT_SUCCESS;
451 goto out;
452err:
453 dev->stats.tx_errors++;
454 kfree_skb(skb);
455out:
456 return ret;
457}
458
459#if IS_ENABLED(CONFIG_IPV6)
460static int ipvlan_process_v6_outbound(struct sk_buff *skb)
461{
462 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
463 struct net_device *dev = skb->dev;
464 struct net *net = dev_net(dev);
465 struct dst_entry *dst;
466 int err, ret = NET_XMIT_DROP;
467 struct flowi6 fl6 = {
468 .flowi6_oif = dev->ifindex,
469 .daddr = ip6h->daddr,
470 .saddr = ip6h->saddr,
471 .flowi6_flags = FLOWI_FLAG_ANYSRC,
472 .flowlabel = ip6_flowinfo(ip6h),
473 .flowi6_mark = skb->mark,
474 .flowi6_proto = ip6h->nexthdr,
475 };
476
477 dst = ip6_route_output(net, NULL, &fl6);
478 if (dst->error) {
479 ret = dst->error;
480 dst_release(dst);
481 goto err;
482 }
483 skb_dst_set(skb, dst);
484 err = ip6_local_out(net, skb->sk, skb);
485 if (unlikely(net_xmit_eval(err)))
486 dev->stats.tx_errors++;
487 else
488 ret = NET_XMIT_SUCCESS;
489 goto out;
490err:
491 dev->stats.tx_errors++;
492 kfree_skb(skb);
493out:
494 return ret;
495}
496#else
497static int ipvlan_process_v6_outbound(struct sk_buff *skb)
498{
499 return NET_XMIT_DROP;
500}
501#endif
502
503static int ipvlan_process_outbound(struct sk_buff *skb)
504{
505 struct ethhdr *ethh = eth_hdr(skb);
506 int ret = NET_XMIT_DROP;
507
508
509
510
511
512 if (skb_mac_header_was_set(skb)) {
513
514
515 if (is_multicast_ether_addr(ethh->h_dest)) {
516 pr_debug_ratelimited(
517 "Dropped {multi|broad}cast of type=[%x]\n",
518 ntohs(skb->protocol));
519 kfree_skb(skb);
520 goto out;
521 }
522
523 skb_pull(skb, sizeof(*ethh));
524 skb->mac_header = (typeof(skb->mac_header))~0U;
525 skb_reset_network_header(skb);
526 }
527
528 if (skb->protocol == htons(ETH_P_IPV6))
529 ret = ipvlan_process_v6_outbound(skb);
530 else if (skb->protocol == htons(ETH_P_IP))
531 ret = ipvlan_process_v4_outbound(skb);
532 else {
533 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
534 ntohs(skb->protocol));
535 kfree_skb(skb);
536 }
537out:
538 return ret;
539}
540
541static void ipvlan_multicast_enqueue(struct ipvl_port *port,
542 struct sk_buff *skb, bool tx_pkt)
543{
544 if (skb->protocol == htons(ETH_P_PAUSE)) {
545 kfree_skb(skb);
546 return;
547 }
548
549
550
551
552
553
554 IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
555
556 spin_lock(&port->backlog.lock);
557 if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
558 if (skb->dev)
559 dev_hold(skb->dev);
560 __skb_queue_tail(&port->backlog, skb);
561 spin_unlock(&port->backlog.lock);
562 schedule_work(&port->wq);
563 } else {
564 spin_unlock(&port->backlog.lock);
565 atomic_long_inc(&skb->dev->rx_dropped);
566 kfree_skb(skb);
567 }
568}
569
570static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
571{
572 const struct ipvl_dev *ipvlan = netdev_priv(dev);
573 void *lyr3h;
574 struct ipvl_addr *addr;
575 int addr_type;
576
577 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
578 if (!lyr3h)
579 goto out;
580
581 if (!ipvlan_is_vepa(ipvlan->port)) {
582 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
583 if (addr) {
584 if (ipvlan_is_private(ipvlan->port)) {
585 consume_skb(skb);
586 return NET_XMIT_DROP;
587 }
588 return ipvlan_rcv_frame(addr, &skb, true);
589 }
590 }
591out:
592 ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
593 return ipvlan_process_outbound(skb);
594}
595
596static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
597{
598 const struct ipvl_dev *ipvlan = netdev_priv(dev);
599 struct ethhdr *eth = eth_hdr(skb);
600 struct ipvl_addr *addr;
601 void *lyr3h;
602 int addr_type;
603
604 if (!ipvlan_is_vepa(ipvlan->port) &&
605 ether_addr_equal(eth->h_dest, eth->h_source)) {
606 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
607 if (lyr3h) {
608 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
609 if (addr) {
610 if (ipvlan_is_private(ipvlan->port)) {
611 consume_skb(skb);
612 return NET_XMIT_DROP;
613 }
614 return ipvlan_rcv_frame(addr, &skb, true);
615 }
616 }
617 skb = skb_share_check(skb, GFP_ATOMIC);
618 if (!skb)
619 return NET_XMIT_DROP;
620
621
622
623
624
625
626 return dev_forward_skb(ipvlan->phy_dev, skb);
627
628 } else if (is_multicast_ether_addr(eth->h_dest)) {
629 ipvlan_skb_crossing_ns(skb, NULL);
630 ipvlan_multicast_enqueue(ipvlan->port, skb, true);
631 return NET_XMIT_SUCCESS;
632 }
633
634 skb->dev = ipvlan->phy_dev;
635 return dev_queue_xmit(skb);
636}
637
638int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
639{
640 struct ipvl_dev *ipvlan = netdev_priv(dev);
641 struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
642
643 if (!port)
644 goto out;
645
646 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
647 goto out;
648
649 switch(port->mode) {
650 case IPVLAN_MODE_L2:
651 return ipvlan_xmit_mode_l2(skb, dev);
652 case IPVLAN_MODE_L3:
653 case IPVLAN_MODE_L3S:
654 return ipvlan_xmit_mode_l3(skb, dev);
655 }
656
657
658 WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
659 port->mode);
660out:
661 kfree_skb(skb);
662 return NET_XMIT_DROP;
663}
664
665static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
666{
667 struct ethhdr *eth = eth_hdr(skb);
668 struct ipvl_addr *addr;
669 void *lyr3h;
670 int addr_type;
671
672 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
673 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
674 if (!lyr3h)
675 return true;
676
677 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
678 if (addr)
679 return false;
680 }
681
682 return true;
683}
684
685static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
686 struct ipvl_port *port)
687{
688 void *lyr3h;
689 int addr_type;
690 struct ipvl_addr *addr;
691 struct sk_buff *skb = *pskb;
692 rx_handler_result_t ret = RX_HANDLER_PASS;
693
694 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
695 if (!lyr3h)
696 goto out;
697
698 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
699 if (addr)
700 ret = ipvlan_rcv_frame(addr, pskb, false);
701
702out:
703 return ret;
704}
705
706static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
707 struct ipvl_port *port)
708{
709 struct sk_buff *skb = *pskb;
710 struct ethhdr *eth = eth_hdr(skb);
711 rx_handler_result_t ret = RX_HANDLER_PASS;
712
713 if (is_multicast_ether_addr(eth->h_dest)) {
714 if (ipvlan_external_frame(skb, port)) {
715 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
716
717
718
719
720
721
722
723 if (nskb) {
724 ipvlan_skb_crossing_ns(nskb, NULL);
725 ipvlan_multicast_enqueue(port, nskb, false);
726 }
727 }
728 } else {
729
730 ret = ipvlan_handle_mode_l3(pskb, port);
731 }
732
733 return ret;
734}
735
736rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
737{
738 struct sk_buff *skb = *pskb;
739 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
740
741 if (!port)
742 return RX_HANDLER_PASS;
743
744 switch (port->mode) {
745 case IPVLAN_MODE_L2:
746 return ipvlan_handle_mode_l2(pskb, port);
747 case IPVLAN_MODE_L3:
748 return ipvlan_handle_mode_l3(pskb, port);
749 case IPVLAN_MODE_L3S:
750 return RX_HANDLER_PASS;
751 }
752
753
754 WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
755 port->mode);
756 kfree_skb(skb);
757 return RX_HANDLER_CONSUMED;
758}
759
760static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb,
761 struct net_device *dev)
762{
763 struct ipvl_addr *addr = NULL;
764 struct ipvl_port *port;
765 void *lyr3h;
766 int addr_type;
767
768 if (!dev || !netif_is_ipvlan_port(dev))
769 goto out;
770
771 port = ipvlan_port_get_rcu(dev);
772 if (!port || port->mode != IPVLAN_MODE_L3S)
773 goto out;
774
775 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
776 if (!lyr3h)
777 goto out;
778
779 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
780out:
781 return addr;
782}
783
784struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb,
785 u16 proto)
786{
787 struct ipvl_addr *addr;
788 struct net_device *sdev;
789
790 addr = ipvlan_skb_to_addr(skb, dev);
791 if (!addr)
792 goto out;
793
794 sdev = addr->master->dev;
795 switch (proto) {
796 case AF_INET:
797 {
798 int err;
799 struct iphdr *ip4h = ip_hdr(skb);
800
801 err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr,
802 ip4h->tos, sdev);
803 if (unlikely(err))
804 goto out;
805 break;
806 }
807#if IS_ENABLED(CONFIG_IPV6)
808 case AF_INET6:
809 {
810 struct dst_entry *dst;
811 struct ipv6hdr *ip6h = ipv6_hdr(skb);
812 int flags = RT6_LOOKUP_F_HAS_SADDR;
813 struct flowi6 fl6 = {
814 .flowi6_iif = sdev->ifindex,
815 .daddr = ip6h->daddr,
816 .saddr = ip6h->saddr,
817 .flowlabel = ip6_flowinfo(ip6h),
818 .flowi6_mark = skb->mark,
819 .flowi6_proto = ip6h->nexthdr,
820 };
821
822 skb_dst_drop(skb);
823 dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6,
824 skb, flags);
825 skb_dst_set(skb, dst);
826 break;
827 }
828#endif
829 default:
830 break;
831 }
832
833out:
834 return skb;
835}
836
837unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
838 const struct nf_hook_state *state)
839{
840 struct ipvl_addr *addr;
841 unsigned int len;
842
843 addr = ipvlan_skb_to_addr(skb, skb->dev);
844 if (!addr)
845 goto out;
846
847 skb->dev = addr->master->dev;
848 len = skb->len + ETH_HLEN;
849 ipvlan_count_rx(addr->master, len, true, false);
850out:
851 return NF_ACCEPT;
852}
853
